Recently Upgraded To Version 40.0 Funny 40th Birthday Shirt Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat Computer nerd humor 40th birthday gift idea Funny gift for any coder or gamer turning 40 years old Lightweight, Classic fit, Double-needle sleeve and bottom hem